CN107058866A - Ferrito-martensite cold-rolled biphase steel and preparation method thereof - Google Patents
Ferrito-martensite cold-rolled biphase steel and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The present invention relates to a kind of ferrito-martensite cold-rolled biphase steel and preparation method thereof.The chemical composition of the cold-rolled biphase steel is constituted by weight percentage is：C：0.02 0.12%；Si：0.04 0.20%；Mn：2.00%~2.80%；Cr：0.70%~1.30%；Al：0.02 0.08%；N≤0.006%；Nb：0.04‑0.12；Ti：0.02 0.12%；P：≤ 0.020%；S：≤ 0.015%；Remaining is Fe and inevitable impurity.The present invention uses low carbon low silicon mentality of designing, improves the formability of steel, improves plate surface quality；Also, the intensity of steel, other elements and the inevitable corresponding change of technique are reduced due to reducing silicone content.Therefore the present invention is the best of breed for producing 980MPa grades of cold-rolled biphase steel chemical compositions and production technology.
Description
Technical field
The present invention relates to field of iron and steel smelting, more particularly to a kind of ferrito-martensite cold-rolled biphase steel and its preparation side
Method.
Background technology
Dual phase steel has the characteristic that intensity is high, yield tensile ratio is low, therefore is widely used on automobile, strong due to DP980 steel
Degree height meets the requirement of automotive light weight technology, therefore application of the steel grade on automobile is more and more extensive.
Patent " the l000MPa grade Ti micro-alloying ultra-fine grained cold rolling two-phases applied according to University of Science ＆ Technology, Beijing Kang Yonglin et al.
Steel and its preparation technology (number of patent application is 201010034472.0) " reports that the design content of Si contents is in its steel：
0.20-0.80%, its silicone content design is higher, is unfavorable for improving the surface quality of cold-reduced sheet.
Patent " the very high strength of the heat application such as A. Mu Lan according to An Saile meter tal fibre research and developments Co., Ltd
Cold-rolled biphase steel sheet material manufacture method and the sheet material (number of patent application is 200980118384.4) that so produces " introduce,
Contain precious alloy as Mo in the design of its steel, be unfavorable for reducing the cost of product.
Liu Rendong according to Angang Stock Co., Ltd et al. application patent " high flexure type 98OMPa grades of cold-rolled biphase steels and
Its preparation technology (number of patent application is 201llO160063.X) " reports that the design content of Si contents is in its steel：0.20-
0.80%, silicone content design content is higher.When silicone content is high, scale on surface that steel plate is formed in heating furnace is more difficult to be gone
Remove, be unfavorable for the surface quality of steel plate.
The patent of Zheng Zhiwang according to Pangang (Group)Panzhihua Iron and Steel Research Institute(PISI) Co., Ltd. et al. applications is " a kind of 98OMPa grades
Cold-rolled biphase steel of ultra-fine grain containing vanadium and preparation method thereof (number of patent application is 201610169781.6) " is introduced, Si in its steel
Content is：0.30-1.00%, Cr content is：The low raising for being unfavorable for two-phase hardness of steel of 0.20-0.80%, Cr content.
The content of the invention
In view of this, the present invention provides a kind of ferrito-martensite cold-rolled biphase steel and preparation method thereof.
The present invention provides a kind of ferrito-martensite cold-rolled biphase steel, and its chemical composition is constituted by weight percentage is：C：
0.02-0.12%；Si：0.04-0.20%；Mn：2.00%~2.80%；Cr：0.70%~1.30%；Al：0.02-
0.08%；N≤0.006%；Nb：0.04-0.12；Ti：0.02-0.12%；P：≤ 0.020%；S：≤ 0.015%；Remaining is
Fe and inevitable impurity.
Further, in the chemical composition of the cold-rolled biphase steel, C percentage by weight is 0.04-0.11%.
Further, in the chemical composition of the cold-rolled biphase steel, Si percentage by weight 0.06-0.18%.
Further, in the chemical composition of the cold-rolled biphase steel, Mn percentage by weight 2.10-2.70%.
Further, in the chemical composition of the cold-rolled biphase steel, Cr percentage by weight is 0.80-1.20%.
Further, in the chemical composition of the cold-rolled biphase steel, Al percentage by weight is 0.02-0.05%.
Further, in the chemical composition of the cold-rolled biphase steel, Nb percentage by weight is 0.05-0.08%, Ti's
Percentage by weight is 0.03-0.08%.
Further, tensile strength >=980MPa of the cold-rolled biphase steel, yield tensile ratio≤0.6, elongation percentage A80 >=
10%.
The present invention also provides a kind of preparation method of above-mentioned ferrito-martensite cold-rolled biphase steel, and it includes following step
Suddenly：
1), smelt and cast
Smelted, refined by any one of claim 1-8 chemical composition, being cast as strand or steel ingot；
2), hot rolling technology
By step 1) obtained strand or steel ingot after heating, hot rolling, cooling down and batching, obtain hot rolled coil；Heating temperature
Spend and be：1180-1280 DEG C, finishing temperature is：880-930 DEG C, the cooling velocity of steel plate is after hot rolling：20-50 DEG C/S, hot rolling is thick
Spend for 2-6mm, coiling temperature is 450-650 DEG C；
3), cold-rolling process
By step 3) in obtained hot rolled coil is cold rolling after overpickling turns into cold rolling version, cold rolling reduction ratio is：50-70%；
4), annealing process
The annealing holding temperature of cold-reduced sheet is：770-840℃；Slow cooling speed C1 is：2-5 DEG C/S, rapid cooling start temperature is：
670-720 DEG C, fast speed of cooling C2 is：15-40 DEG C/S, 170-340 DEG C of overaging temperature is cooled to by rapid cooling, room is finally cooled to
Temperature.
Further, step 2) in after hot rolling the cooling velocity of steel plate be：20-35℃/S.
Beneficial effects of the present invention are as follows：
(1) low carbon low silicon mentality of designing is used, the formability of steel is improved, improves plate surface quality；
(2) intensity of steel, other elements and the inevitable corresponding change of technique are reduced due to reducing silicone content.Therefore this hair
Bright is the best of breed for producing 980MPa grades of cold-rolled biphase steel chemical compositions and production technology.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described.
Rolling mill practice schematic diagram in ferrito-martensite cold-rolled biphase steel that Fig. 1 provides for the present invention and preparation method thereof；
Annealing process is illustrated in ferrito-martensite cold-rolled biphase steel that Fig. 2 provides for the present invention and preparation method thereof.
Embodiment
The invention discloses a kind of ferrito-martensite cold-rolled biphase steel and preparation method thereof, those skilled in the art can be with
Present disclosure is used for reference, technological parameter realization is suitably modified.In particular, all similar replacements and change are to ability
It is it will be apparent that they are considered as being included in the present invention for field technique personnel.The method of the present invention and application have been led to
Cross preferred embodiment to be described, related personnel substantially can be not departing from present invention, in spirit and scope to this paper institutes
The methods and applications stated are modified or suitably change is with combining, to realize and apply the technology of the present invention.
The present invention provides a kind of ferrito-martensite cold-rolled biphase steel, and its chemical composition is constituted by weight percentage is：C：
0.02-0.12%；Si：0.04-0.20%；Mn：2.00%~2.80%；Cr：0.70%~1.30%；Al：0.02-
0.08%；N≤0.006%；Nb：0.04-0.12；Ti：0.02-0.12%；P：≤ 0.020%；S：≤ 0.015%；Remaining is
Fe and inevitable impurity.
The alloy design of the present invention is according to as follows：
C：Carbon is one of basic element in steel.Carbon content is relatively low, is conducive to improving the forming property and weldability of product
Energy.Carbon content is too low, and the hardenability of martensite declines.Carbon content is typically not less than 0.02% in dual phase steel.Therefore, selection carbon contains
Measure as 0.02-0.12%, it is preferred that carbon content is 0.04-0.11%.
Si:Element silicon can improve the intensity of ferrite and austenite, but the Surface Oxygen that its content height is formed in heating furnace
Change the more difficult removal of iron sheet, so as to influence the surface quality of cold-rolled biphase steel, therefore the silicone content control in steel is existed：0.04-
0.20%, it is preferred that silicone content is 0.06-0.18%.
Mn:Manganese is solution strengthening element, and manganese can improve the stability of austenite, significantly reduces the critical cooling of martensite
Speed.Manganese content is typically not less than in 1.20%, too low manganese steel Mn/S than low in dual phase steel, and the continuous casting to steel brings matter
Measure hidden danger.Therefore, manganese content can be controlled in 2.00%~2.80%, it is preferred that manganese content is 2.10-2.70%.
Cr：Chromium is conducive to austenite to be fully changed into martensite, so as to obtain higher tensile strength.But chromium is too high
The welding performance of steel can be reduced, therefore by chromium control in 0.70-1.30%, it is preferred that chromium content is 0.80-
1.20%.
Ti:Titanium elements, which are dissolved in steel, can improve the strength and toughness of steel, particularly can eliminate nitrogen in steel element with fixed nitrogen
Harm, but it is too high can improve the cost of steel, therefore titanium elements control is existed：0.02%~0.12%, it is preferred that Ti content is
0.03-0.08%.
Al:Aluminium is strong deoxidier, and aluminium content is higher, then oxygen content in steel is lower, and the quality of steel is better, but aluminium content mistake
The cost of height increase steel.Therefore by aluminium element control in 0.02-0.08%, it is preferred that aluminium element is 0.02-0.05%.
Nb：The niobium in steel is solid-solubilized in rolling process, austenite grain boundary is pinned at by the carbonitride of niobium, refinement is difficult to understand
Family name's body crystal grain.So as to be conducive to fine-grained steel to produce.Therefore by content of niobium control in steel in 0.04-0.12%, it is preferred that niobium contains
Measure as 0.05-0.08%.
P：Phosphorus is harmful element in steel, more low better, but too low in view of phosphorus content in steel, manufacturing cost increase, therefore
It is required that P content≤0.020%.
S：Sulphur is harmful element in steel, more low better, but too low in view of sulfur content in steel, manufacturing cost increase, therefore
It is required that S content≤0.015%.
N：Nitrogen in steel is generally harmful element, more low better, but too low in view of nitrogen in steel content, manufacturing cost increase,
Therefore it is required that N content≤0.006%.
Further, the steel grade of above-mentioned chemical composition, after smelting, casting, hot rolling, cold rolling and annealing, obtained DP980 iron
Ferritic martensite cold-rolled biphase steel tensile strength >=980MPa, yield tensile ratio≤0.6, elongation percentage A80 >=10%, indices are complete
The requirement of full up sufficient market and user to DP980 steel.
The advantage that what the present invention was provided state ferrito-martensite cold-rolled biphase steel is：Belong to low-carbon, low silicon design steel grade,
Both the intensity required for user had been met, and has improved because silicone content is low the surface quality of dual phase steel, and has not added Ni, Mo
Deng noble metal, have the advantages that prominent；And ultrafast refrigeration technique is used after slab hot rolling.
Incorporated by reference to Fig. 1 and Fig. 2, the present invention also provides a kind of preparation method of above-mentioned ferrito-martensite cold-rolled biphase steel,
It comprises the following steps：
1), smelt and cast
Smelted, refined by above-mentioned chemical composition, being cast as strand or steel ingot；
2), hot rolling technology
By step 1) obtained strand or steel ingot after heating, hot rolling, cooling down and batching, obtain hot rolled coil；Heating temperature
Spend and be：1180-1280 DEG C, finishing temperature is：880-930 DEG C, the cooling velocity of steel plate is after hot rolling：20-50 DEG C/S, hot rolling is thick
Spend for 2-6mm, coiling temperature is 450-650 DEG C；
3), cold-rolling process
By step 3) in obtained hot rolled coil is cold rolling after overpickling turns into cold rolling version, cold rolling reduction ratio is：50-70%；
4), annealing process
The annealing holding temperature of cold-reduced sheet is：770-840℃；Slow cooling speed C1 is：2-5 DEG C/S, rapid cooling start temperature is：
670-720 DEG C, fast speed of cooling C2 is：15-40 DEG C/S, 170-340 DEG C of overaging temperature is cooled to by rapid cooling, room is finally cooled to
Temperature.
Preferably, step 2) in after hot rolling the cooling velocity of steel plate be：20-35℃/S.
Beneficial effects of the present invention are as follows：
(1) low carbon low silicon mentality of designing is used, the formability of steel is improved, improves plate surface quality；
(2) intensity of steel, other elements and the inevitable corresponding change of technique are reduced due to reducing silicone content.Therefore this hair
Bright is the best of breed for producing 980MPa grades of cold-rolled biphase steel chemical compositions and production technology.
With reference to embodiment, the present invention is expanded on further：
Embodiment 1
The present embodiment DP980 dual phase steels, (1) its composition is made up of following percentage by weight：C:0.05%, Si:0.08%,
Mn:2.31%, Cr:0.76%, Al:0.06%, N:0.0036%, Nb:0.08%, Ti:0.07%, P:0.016%, S:
0.013%, remaining is iron and inevitable impurity element；Finished product thickness is 0.8mm, and (2) smelt and hot rolling production process is：
The continuous casting steel billet one of one external refining of converter smelting one heats a hot rolling-cool down-batch and obtains hot rolled coil.Heating-up temperature is：
1210 DEG C, finishing temperature is：890 DEG C, the cooling velocity of steel plate is after hot rolling：25 DEG C/S, hot rolled thickness is 2.5mm, batches temperature
Spend for 550 DEG C；(3) cold rolling reduction ratio is 68%；(4) annealing process is：The annealing holding temperature of cold-reduced sheet is：790℃；Slow cooling
Speed C1 is：3 DEG C/S, rapid cooling start temperature is：690 DEG C, fast speed of cooling C2 is：21 DEG C/S, overaging temperature is cooled to by rapid cooling
290 DEG C of degree, is finally cooled to room temperature.
Embodiment 2
The present embodiment DP980 dual phase steels, (1) its composition is made up of following percentage by weight：C:0.08%, Si:0.13%,
Mn:2.43%, Cr:0.81%, Al:0.07%, N:0.0043%, Nb:0.09%, Ti:0.05%, P:0.015%, S:
0.011%, remaining is iron and inevitable impurity element；Finished product thickness is 0.8mm, and (2) smelt and hot rolling production process is：
The continuous casting steel billet one of one external refining of converter smelting one heats a hot rolling-cool down-batch and obtains hot rolled coil.Heating-up temperature is：
1230 DEG C, finishing temperature is：900 DEG C, the cooling velocity of steel plate is after hot rolling：28 DEG C/S, hot rolled thickness is 2.5mm, batches temperature
Spend for 580 DEG C；(3) cold rolling reduction ratio is 68%；(4) annealing process is：The annealing holding temperature of cold-reduced sheet is：800℃；Slow cooling
Speed C1 is：4 DEG C/S, rapid cooling start temperature is：700 DEG C, fast speed of cooling C2 is：23 DEG C/S, overaging temperature is cooled to by rapid cooling
300 DEG C of degree, is finally cooled to room temperature.
Embodiment 3
The present embodiment DP980 dual phase steels, (1) its composition is made up of following percentage by weight：C:0.07%, Si:0.10%,
Mn:2.15%, Cr:0.81%, Al:0.05%, N:0.0055%, Nb:0.09%, Ti:0.08%, P:0.018%, S:
0.009%, remaining is iron and inevitable impurity element；Finished product thickness is 1mm, and (2) smelt and hot rolling production process is：Turn
Stove, which smelts an external refining one continuous casting steel billet one and heats a hot rolling-cool down-batch, obtains hot rolled coil.Heating-up temperature is：1230
DEG C, finishing temperature is：920 DEG C, the cooling velocity of steel plate is after hot rolling：30 DEG C/S, hot rolled thickness is 2.5mm, and coiling temperature is
590℃；(3) cold rolling reduction ratio is 60%；(4) annealing process is：The annealing holding temperature of cold-reduced sheet is：830℃；Slow cooling speed
C1 is：2 DEG C/S, rapid cooling start temperature is：710 DEG C, fast speed of cooling C2 is：30 DEG C/S, overaging temperature 330 is cooled to by rapid cooling
DEG C, finally it is cooled to room temperature.
Embodiment 4
The present embodiment DP980 dual phase steels, (1) its composition is made up of following percentage by weight：C:0.06%, Si:0.17%,
Mn:2.55%, Cr:0.87%, Al:0.07%, N:0.0051%, Nb:0.10%, Ti:0.09%, P:0.017%, S:
0.007%, remaining is iron and inevitable impurity element；Finished product thickness is 1mm, and (2) smelt and hot rolling production process is：Turn
Stove, which smelts an external refining one continuous casting steel billet one and heats a hot rolling-cool down-batch, obtains hot rolled coil.Heating-up temperature is：1250
DEG C, finishing temperature is：910 DEG C, the cooling velocity of steel plate is after hot rolling：35 DEG C/S, hot rolled thickness is 2.5mm, and coiling temperature is
610℃；(3) cold rolling reduction ratio is 60%；(4) annealing process is：The annealing holding temperature of cold-reduced sheet is：780℃；Slow cooling speed
C1 is：3 DEG C/S, rapid cooling start temperature is：680 DEG C, fast speed of cooling C2 is：32 DEG C/S, overaging temperature 310 is cooled to by rapid cooling
DEG C, finally it is cooled to room temperature.
Embodiment 5
The present embodiment DP980 dual phase steels, (1) its composition is made up of following percentage by weight：C:0.05%, Si:0.13%,
Mn:2.16%, Cr:0.91%, Al:0.05%, N:0.0039%, Nb:0.11%, Ti:0.08%, P:0.014%, S:
0.006%, remaining is iron and inevitable impurity element；Finished product thickness is 1.2mm, and (2) smelt and hot rolling production process is：
The continuous casting steel billet one of one external refining of converter smelting one heats a hot rolling-cool down-batch and obtains hot rolled coil.Heating-up temperature is：
1230 DEG C, finishing temperature is：900 DEG C, the cooling velocity of steel plate is after hot rolling：38 DEG C/S, hot rolled thickness is 2.0mm, batches temperature
Spend for 600 DEG C；(3) cold rolling reduction ratio is 66.7%；(4) annealing process is：The annealing holding temperature of cold-reduced sheet is：790℃；It is slow
Speed of cooling C1 is：2 DEG C/S, rapid cooling start temperature is：690 DEG C, fast speed of cooling C2 is：36 DEG C/S, overaging is cooled to by rapid cooling
320 DEG C of temperature, is finally cooled to room temperature.
Table 1 lists embodiment 1-5DP980 dual phase steels with Pangang (Group)Panzhihua Iron and Steel Research Institute(PISI) Co., Ltd. in 2016
Patent " a kind of 980MPa grades of ultra-fine grain containing vanadium cold-rolled biphase steel and preparation method thereof " (patent application filed on March 23, in
Number for 201610169781.6) product mechanical property contrast.From contrast, DP980 dual phase steels produced by the invention, mechanics
Performance is suitable with climbing steel, and because using the design of low silicon, the surface quality of product preferably, is adapted to the product for doing Thin Specs.
The properties of product of the present invention of table 1 and the properties of product of Pangang (Group)Panzhihua Iron and Steel Research Institute(PISI) Co., Ltd. are contrasted
As a result show, cold-rolled biphase steel microscopic structure prepared by the present invention is：Ferrite and martensite, its yield strength
(500-570MPa) and yield tensile ratio are relatively low (≤0.53), and tensile strength (1030-1080MPa) and elongation are higher (>=13%),
Meet requirement of the user to DP980 dual phase steels.Due to low carbon low silicon design, the forming property of product is good and surface quality is excellent,
Welcome by user.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of ferrito-martensite cold-rolled biphase steel, it is characterised in that its chemical composition is constituted by weight percentage is：C：
0.02-0.12%；Si：0.04-0.20%；Mn：2.00%~2.80%；Cr：0.70%~1.30%；Al：0.02-
0.08%；N≤0.006%；Nb：0.04-0.12；Ti：0.02-0.12%；P：≤ 0.020%；S：≤ 0.015%；Remaining is
Fe and inevitable impurity.
2. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, C percentage by weight is 0.04-0.11%.
3. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, Si percentage by weight 0.06-0.18%.
4. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, Mn percentage by weight 2.10-2.70%.
5. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, Cr percentage by weight is 0.80-1.20%.
6. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, Al percentage by weight is 0.02-0.05%.
7. ferrito-martensite cold-rolled biphase steel according to claim 1, it is characterised in that the change of the cold-rolled biphase steel
In studying point, Nb percentage by weight is 0.05-0.08%, and Ti percentage by weight is 0.03-0.08%.
8. the ferrito-martensite cold-rolled biphase steel according to claim 1 to 7 any one, it is characterised in that described cold
Roll tensile strength >=980MPa of dual phase steel, yield tensile ratio≤0.6, elongation percentage A80 >=10%.
9. the preparation method of the ferrito-martensite cold-rolled biphase steel according to claim 1 to 8 any one, its feature exists
In comprising the following steps：
1), smelt and cast
Smelted, refined by any one of claim 1-8 chemical composition, being cast as strand or steel ingot；
2), hot rolling technology
By step 1) obtained strand or steel ingot after heating, hot rolling, cooling down and batching, obtain hot rolled coil；Heating-up temperature is：
1180-1280 DEG C, finishing temperature is：880-930 DEG C, the cooling velocity of steel plate is after hot rolling：20-50 DEG C/S, hot rolled thickness is
2-6mm, coiling temperature is 450-650 DEG C；
3), cold-rolling process
By step 3) in obtained hot rolled coil is cold rolling after overpickling turns into cold rolling version, cold rolling reduction ratio is：50-70%；
4), annealing process
The annealing holding temperature of cold-reduced sheet is：770-840℃；Slow cooling speed C1 is：2-5 DEG C/S, rapid cooling start temperature is：670-
720 DEG C, fast speed of cooling C2 is：15-40 DEG C/S, 170-340 DEG C of overaging temperature is cooled to by rapid cooling, room temperature is finally cooled to.
10. the preparation method of ferrito-martensite cold-rolled biphase steel according to claim 9, it is characterised in that step 2)
The cooling velocity of steel plate is after middle hot rolling：20-35℃/S.
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| CN110343953A (en) * | 2019-07-09 | 2019-10-18 | 武汉钢铁有限公司 | The 800MPa grade cold-rolled steel and production method of a kind of value >=0.155 hardenability value n |
| CN111455266A (en) * | 2020-02-17 | 2020-07-28 | 本钢板材股份有限公司 | 980 MPa-grade low-yield cold-rolled dual-phase steel and preparation method thereof |
| CN115029622A (en) * | 2022-04-29 | 2022-09-09 | 武汉钢铁有限公司 | High-surface-quality hot-rolled dual-phase steel and production process thereof |
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| CN115029622A (en) * | 2022-04-29 | 2022-09-09 | 武汉钢铁有限公司 | High-surface-quality hot-rolled dual-phase steel and production process thereof |
| CN115029622B (en) * | 2022-04-29 | 2023-05-23 | 武汉钢铁有限公司 | High-surface-quality hot-rolled dual-phase steel and production process thereof |
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